Novel role for surfactant protein A in gastrointestinal graft-versus-host disease.

Novel role for surfactant protein A in gastrointestinal graft-versus-host disease.
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DOI:
10.4049/jimmunol.1103558
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发表时间:
2012-05-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Palmer SM
Palmer SM
中科院分区:
其他
文献类型:
--
作者:
Gowdy KM;Cardona DM;Nugent JL;Giamberardino C;Thomas JM;Mukherjee S;Martinu T;Foster WM;Plevy SE;Pastva AM;Wright JR;Palmer SM

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移植物抗宿主病(GVHD)是同种异体骨髓移植(BMT)的一种严重且常见的并发症,涉及胃肠道和肺部。 GVHD 的病理学很复杂,涉及免疫细胞将宿主抗原识别为外来抗原。我们假设集合素表面活性蛋白 A (SP-A) 在调节同种异体 BMT 后 GVHD 的发展中发挥核心作用。 C57BL/6(H2b;WT)和 SP-A 缺陷小鼠对 C57BL/6 背景(H2b;SP-A−/−)小鼠进行同种异体(Allo)或同基因(Syn)BMT,细胞来自 C3HeB/FeJ(H2k;SP-A−/−alloBMT 或 WTalloBMT)或 C57Bl/6(H2b; SP-A−/−synBMT 或 WTsynBMT) 小鼠。 BMT 后 5 周,对小鼠进行尸检并分析肺和胃肠 (GI) 组织。 SP-A−/−alloBMT 或 WTalloBMT 在肺部病理学上没有显着差异,然而,SP-A−/−alloBMT 小鼠出现了胃肠道 GVHD 的显着特征,包括体重减轻、组织炎症增加和淋巴细胞浸润。 SP-A−/−alloBMT 小鼠的结肠 IL-1β、IL-6、TNF-α 和 IFN-γ 表达也增加,Th17 细胞增加,调节性 T (Treg) 细胞减少。我们的结果首次证明了 SP-A 在调节 GI GVHD 中的关键作用。在这些研究中,我们证明,接受同种异体骨髓移植的 ​​SP-A 缺陷小鼠的胃肠道 GVHD 发生率更高,这与 Th17 细胞增加和 Tregs 减少有关。这些研究结果表明,SP-A 可以防止胃肠道 GVHD 的发生,并确立了 SP-A 在调节胃肠道免疫反应中的作用。
Graft-versus-host-disease (GVHD) is a severe and frequent complication of allogeneic bone marrow transplantation (BMT) that involves the gastrointestinal tract and lungs. The pathobiology of GVHD is complex and involves immune cell recognition of host antigens as foreign. We hypothesize a central role for the collectin surfactant protein A (SP-A) in regulating the development of GVHD after allogeneic BMT. C57BL/6 (H2b; WT) and SP-A deficient mice on C57BL/6 background (H2b; SP-A−/−) mice underwent allogeneic (Allo) or syngeneic (Syn) BMT with cells from either C3HeB/FeJ (H2k; SP-A−/−alloBMT or WTalloBMT) or C57Bl/6 (H2b; SP-A−/−synBMT or WTsynBMT) mice. 5 weeks post BMT, mice were necropsied and lung and gastrointestinal (GI) tissue were analyzed. SP-A−/−alloBMT or WTalloBMT had no significant differences in lung pathology however, SP-A−/−alloBMT mice developed marked features of GI GVHD including decreased body weight, increased tissue inflammation and lymphocytic infiltration. SP-A−/−alloBMT mice also had increased colon expression of IL-1β, IL-6, TNF-α, and IFN-γ and as well as increased Th17 cells, and diminished regulatory T (Treg) cells. Our results demonstrate the first evidence of a critical role for SP-A in modulating GI GVHD. In these studies, we demonstrate that mice deficient in SP-A that have undergone an alloBMT have a greater incidence of GI GVHD that is associated with increased Th17 cells and decreased Tregs. The results of these studies demonstrate that SP-A protects against the development of GI GVHD and establishes a role for SP-A in regulating the immune response in the GI tract.
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